[DSL] ping is fixed

i made requsted different profile from my ISP just for testing, i dont have comments for throughput.. but the ping test is fixed all the cases as the following:using 1Mb/s average ping ~ 43msusing 2Mb/s average ping ~ 43msusing 4Mb/s average ping ~ 43msusing 8Mb/s average ping ~ 43msusing 16Mb/s average ping ~ 43msusing 20Mb/s average ping ~ 43mswhy the latency is equal... i was expecting less time..